2 years ago

Cos (pi/11)+cos (3pi/11)+cos (5pi/11)+cos (7pi/11)+cos(9pi/11)

1 answer:

4 0

All you have to do is input these terms in a scientific calculator and you would immediately get the answer. However, you should note that the units are in radians. Therefore, make sure that your calculator is in the mode of radians before inputing. Then, you would get an answer of 1/2.

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Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. Day Sunday Monday Tuesd

adell [148]

Answer:

$4\dfrac{2}{7}$

Step-by-step explanation:

How to calculate the mean absolute deviation:

Step 1: Calculate the mean.

$\text{Mean}=\dfrac{49+55+52+46+47+42+38}{7}=47$

Step 2: Calculate how far away each data point is from the mean using positive distances. These are called absolute deviations.

$\begin{array}{ccccccc}\text{Sun}&\text{Mon}&\text{Tue}&\text{Wed}&\text{Thu}&\text{Fri}&\text{Sat}\\49&55&52&46&47&42&38\\2&8&5&1&0&5&9\end{array}$

Step 3: Add those deviations together.

$\sum|\text{mean}-x_i|=2+8+4+1+0+5+9=30$

Step 4: Divide the sum by the number of data points.

$\text{MAD}=\dfrac{\sum|\text{mean}-x_i|}{n}=\dfrac{30}{7}=4\dfrac{2}{7}$

8 0

2 years ago

Which expression is equivalent to the given expression? -2.12 + 8r - 9 + 40 + 712 + 2 O A. 512 + 12r - 7 OB.5.12 + 4x + 11 O C.

cricket20 [7]

Answer:

use microsoft maths solver

7 0

2 years ago

Steven conjectures that for |x|>5, it is true that x^3>125. Is his conjecture correct? Why or why not?

levacccp [35]

Answer:

yes

Step-by-step explanation:

it is correct because, since x>5, anything relating x and 5 together will always put x greater than 5.

8 0

2 years ago

The numbers to the items:3.99 6.00 4.50 now question. He principal at Gotham Elementary bought each teacher the three items show

sashaice [31]

Answer:

Step-by-step explanation:

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2 years ago

What is the factorization of the polynomial below? -3x^3+15x^2+42x

kherson [118]

Factoring out x

x(-3x^2+15x+42) now factor parenthetical expression

x(-3x^2+21x-6x+42)

x(-3x(x-7)-6(x-7))

x(-3x-6)(x-7) we can factor out -3 from first parentheses

-3x(x+2)(x-7)

7 0

2 years ago